LG Refrigerator Error Code F-19

F-19 indicates a Freezer Defrost Sensor error. The main PCB has detected that the sensor's signal is outside the acceptable voltage range of 1.0V to 4.5V at connector CN30, or the sensor is reporting a temperature above 149°F (65°C) or below -58°F (-50°C). This can result from a dislodged sensor, wiring damage, or a failed sensor component.

A malfunctioning defrost sensor means the freezer defrost cycle may not operate correctly. Over time, frost can accumulate on the evaporator coil, reducing cooling efficiency and potentially causing food safety concerns. It is best to address the fault promptly rather than continue using the unit with the error active.

A power reset may temporarily clear the F-19 code, but if the underlying problem with the sensor, wiring, or connector has not been fixed, the code will return. Resetting without addressing the root cause is not a lasting solution. The fault needs to be diagnosed and repaired for the code to stay clear.

Some causes of F-19 are DIY-accessible. If the sensor has simply slipped out of its bracket, reseating it may resolve the fault. Checking and reseating the CN30 connector on the main PCB is also straightforward. Replacing a failed thermistor sensor or repairing damaged wiring requires basic electrical skills and comfort working inside the freezer compartment.

If the repair only requires reseating the sensor or connector, there may be no parts cost at all. If a new defrost sensor thermistor is needed, parts typically range from $15 to $50 depending on the model. Adding professional labor, the total repair cost can range from $100 to $250 or more depending on your location and the technician's rates.